{"common":{"save":0,"post_id":"6410","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"6542","mon_id":"1158790","chapter_id":"1159772","post_id":"6410","question":"<p>M\u1ed9t v\u1eadt \u0111\u01b0\u1ee3c n&eacute;m th\u1eb3ng \u0111\u1ee9ng l&ecirc;n cao t\u1eeb m\u1eb7t \u0111\u1ea5t v\u1edbi v\u1eadn t\u1ed1c 6 m\/s, b\u1ecf qua s\u1ee9c c\u1ea3n kh&ocirc;ng kh&iacute;, l\u1ea5y g = 10 m\/<span class=\"math-tex\">$s^2$<\/span>. V\u1ecb tr&iacute; m&agrave; th\u1ebf n\u0103ng b\u1eb1ng \u0111\u1ed9ng n\u0103ng c&oacute; \u0111\u1ed9 cao l&agrave;:<\/p>","options":["<strong>A. <\/strong>0,9 m.","<strong>B. <\/strong>1,8 m.","<strong>C. <\/strong>3 m.","<strong>D.<\/strong> 5 m."],"correct":"1","level":"3","hint":"","answer":"<p>Ch\u1ecdn m\u1ed1c t&iacute;nh th\u1ebf n\u0103ng t\u1ea1i v\u1ecb tr&iacute; n&eacute;m (m\u1eb7t \u0111\u1ea5t).<br \/>C\u01a1 n\u0103ng t\u1ea1i v\u1ecb tr&iacute; n&eacute;m: <span class=\"math-tex\">$W= \\frac{1}{2}mv^2$<\/span>&nbsp; (h = 0 n&ecirc;n <span class=\"math-tex\">$W_t$<\/span>&nbsp;= 0)<br \/>Khi th\u1ebf n\u0103ng b\u1eb1ng \u0111\u1ed9ng n\u0103ng:&nbsp;<\/p><p><span class=\"svgedit\"><svg height=\"62\" width=\"233\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\"> <g> &lt;title&gt;&lt;\/title&gt; <rect fill=\"#fff\" height=\"64\" id=\"canvas_background\" width=\"235\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" height=\"100%\" id=\"canvasGrid\" overflow=\"visible\" width=\"100%\" x=\"0\" y=\"0\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g> &lt;title&gt;&lt;\/title&gt; <image height=\"61.14333\" id=\"svg_1\" stroke=\"null\" width=\"221\" x=\"4\" xlink:href=\"data:image\/png;base64,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\" y=\"3.5\"><\/image> <\/g> <\/svg><\/span><br \/>&nbsp;<span class=\"math-tex\">$\\Rightarrow mgh&rsquo;= \\frac{mv^2}{4} \\Rightarrow h= \\frac{v^2}{4.g}= \\frac{6^2}{4.10}= 0,9m$<\/span><br \/>\u0110&aacute;p &aacute;n \u0111&uacute;ng: <span style=\"color:#16a085;\"><strong>A. 0,9 m.<\/strong><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"149","test":"0","date":"2023-04-03 14:40:28","option_type":"txt","len":0},{"id":"6543","mon_id":"1158790","chapter_id":"1159772","post_id":"6410","question":"<p>M\u1ed9t v\u1eadt c&oacute; kh\u1ed1i l\u01b0\u1ee3ng 100 g \u0111\u01b0\u1ee3c n&eacute;m th\u1eb3ng \u0111\u1ee9ng t\u1eeb d\u01b0\u1edbi l&ecirc;n v\u1edbi v\u1eadn t\u1ed1c <span class=\"math-tex\">$v_0$<\/span>&nbsp;= 20 m\/s. X&aacute;c \u0111\u1ecbnh c\u01a1 n\u0103ng c\u1ee7a v\u1eadt khi chuy\u1ec3n \u0111\u1ed9ng?<\/p>","options":["<strong>A. <\/strong>0 J.","<strong>B.<\/strong> 20 J.","<strong>C. <\/strong>10 J.","<strong>D.<\/strong> 1 J."],"correct":"2","level":"3","hint":"","answer":"<p>Ch\u1ecdn g\u1ed1c th\u1ebf n\u0103ng t\u1ea1i v\u1ecb tr&iacute; n&eacute;m<br \/>T\u1ea1i v\u1ecb tr&iacute; n&eacute;m v\u1eadt ta c&oacute;:&nbsp;<br \/>+ Th\u1ebf n\u0103ng c\u1ee7a v\u1eadt t\u1ea1i \u0111&oacute;: &nbsp;<span class=\"math-tex\">$W_t= 0$<\/span><br \/>+ \u0110\u1ed9ng n\u0103ng c\u1ee7a v\u1eadt t\u1ea1i \u0111&oacute;:&nbsp;<span class=\"math-tex\">$W_d= \\frac{1}{2}mv_0^2= \\frac{1}{2}. 0,1. 20^2= 20J$<\/span><br \/>=&gt; C\u01a1 n\u0103ng c\u1ee7a v\u1eadt: &nbsp;<span class=\"math-tex\">$W= W_d + W_t= 20 +0= 20J$<\/span><br \/>\u0110&aacute;p &aacute;n \u0111&uacute;ng:<span style=\"color:#16a085;\"><strong> B. 20 J.<\/strong><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"149","test":"0","date":"2023-04-03 14:46:22","option_type":"txt","len":0},{"id":"6544","mon_id":"1158790","chapter_id":"1159772","post_id":"6410","question":"<p>M\u1ed9t h&ograve;n bi kh\u1ed1i l\u01b0\u1ee3ng 20 g \u0111\u01b0\u1ee3c n&eacute;m th\u1eb3ng \u0111\u1ee9ng l&ecirc;n cao v\u1edbi v\u1eadn t\u1ed1c 4 m\/s t\u1eeb \u0111\u1ed9 cao 1,6 m so v\u1edbi m\u1eb7t \u0111\u1ea5t. Cho g = 9,8 m\/<span class=\"math-tex\">$s^2$<\/span>. L\u1ea5y m\u1ed1c th\u1ebf n\u0103ng g\u1eafn v\u1edbi m\u1eb7t \u0111\u1ea5t, c&aacute;c gi&aacute; tr\u1ecb \u0111\u1ed9ng n\u0103ng, th\u1ebf n\u0103ng v&agrave; c\u01a1 n\u0103ng c\u1ee7a h&ograve;n bi t\u1ea1i l&uacute;c n&eacute;m v\u1eadt l&agrave;:<\/p>","options":["<strong>A.<\/strong> 0,16 J; 0,31 J; 0,47 J.","<strong>B.<\/strong> 0,32 J; 0,62 J; 0,47 J.","<strong>C.<\/strong> 0,24 J; 0,18 J; 0,54 J.","<strong>D. <\/strong>0,18J ; 0,48 J; 0,80 J."],"correct":"1","level":"3","hint":"","answer":"<p>\u0110\u1ed5i \u0111\u01a1n v\u1ecb: 20 g = 20.<span class=\"math-tex\">$10^{-3}$<\/span>&nbsp;kg<br \/>X&eacute;t m\u1ed1c th\u1ebf n\u0103ng t\u1ea1i m\u1eb7t \u0111\u1ea5t.<br \/>\u0110\u1ed9ng n\u0103ng c\u1ee7a v\u1eadt:&nbsp;<span class=\"math-tex\">$W_\u0111= \\frac{mv^2}{2}= \\frac{20.10^{-3}. 4^2}{2}= 0,16J$<\/span><br \/>Th\u1ebf n\u0103ng c\u1ee7a v\u1eadt:&nbsp;&nbsp;<span class=\"math-tex\">$W_t= mgh=20.10^{-3}. 9,8.1,6\\approx 0,31J$<\/span><br \/>C\u01a1 n\u0103ng c\u1ee7a v\u1eadt l&agrave;:&nbsp;&nbsp;<span class=\"math-tex\">$W= W_\u0111+ W_t= 0,16+ 0,31= 0,47J$<\/span><br \/>\u0110&aacute;p &aacute;n \u0111&uacute;ng: <span style=\"color:#16a085;\"><strong>A. 0,16 J; 0,31 J; 0,47 J.<\/strong><\/span><\/p>","type":"choose","extra_type":"classic","user_id":"149","test":"0","date":"2023-04-03 14:57:49","option_type":"txt","len":2}]}